From: Roland McGrath <roland@redhat.com>

This adds a const to the definitions vvar.c makes, so that the vdso_*
variables go into .rodata instead of .data.  This is essentially a cosmetic
change, just giving the section headers in the vDSO file more pleasing flags. 
These variables are read-only from the perspective of the vDSO itself and user
mode, even though the contents of the DSO image were adjusted at boot.

Signed-off-by: Roland McGrath <roland@redhat.com>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---


diff -puN arch/x86_64/vdso/vvar.c~x86_64-vdso-put-vars-in-rodata arch/x86_64/vdso/vvar.c
--- a/arch/x86_64/vdso/vvar.c~x86_64-vdso-put-vars-in-rodata
+++ a/arch/x86_64/vdso/vvar.c
@@ -8,5 +8,5 @@
 #include <asm/timex.h>
 #include <asm/vgtod.h>
 
-#define VEXTERN(x) typeof (__ ## x) *vdso_ ## x = (void *)VMAGIC;
+#define VEXTERN(x) typeof (__ ## x) *const vdso_ ## x = (void *)VMAGIC;
 #include "vextern.h"
_